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Science · Earth sciences
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The spectra lines of a fast rotating star are broader than the lines of a slowly rotating star. Why?

A. Because the pressure in the photosphere is lower at fast rotation rates
B. Because differential rotation will show up as different velocities and hence different Doppler shifts in the spectrum

C.

Because most electrons are no longer bound to the atomic nuclei at fast rotation

D.

Because the light from the side of the star that is rotating toward us is blue-shifted and the light from the opposite side is red-shifted due to the Doppler effect

E.

Because the spectral lines of a slowly rotating star have a reduced pressure broadening
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